Filter element



v l l I l l I, lill llllllll 1 v INVENTOR. .WM 6. ba/f BY Auml Oct. 2, 1951 W. S. CQOK FILTER ELEMENT Filed March 20, 1947 Patented Oct. 2, 1951 Wayne S. Cook, Grand Rapids, Michgfassignor to Sackner Products, Inc., a `corporation of Michigan Application March 20, 1947, Serial No. 736,089` i 1 Claim. l This invention relates to filter and fllter elements. y y

`The main objects of this invention are:

First, to provide a lilter element or sheet which is adapted to be convolutely wound with a spacer and one which provides a Very large amount `of filtering area in proportion to the size of the filter.

Second, to provide a filter for the lubricant of motor vehicles and the like in which the filtering element isformed of paper and at the same time is highly efiicient while permitting a desirable flow of lubricant.

Third, to provide a filtering sheet or blanket having these advantages which may be very economically produced.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claim.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is an end view of an oil filter unit embodying my invention.

Fig. a fragmentary side elevational view of the filtering unit partially wound, parts being broken away to show structural details and parts being conventionally shown.

Fig. 3 is an enlarged view in section on a line corresponding to line 3--3 of Fig. 2.

Fig. 4 is a fragmentary view in section corresponding to that of Fig. 3 showing a modified form or embodiment of the invention.

In the accompanying drawing I illustrate an embodiment of the filter sheet or blanket as particularly designed to be used with a spacer element designated generally by the numeral I, this spacer element being that shown in the Daniel J. Wall application for patent, Serial No. 604,905, filed July 13, 1945, which comprises a corrugated strip 2, the corrugations being Secured together by the longitudinal strip 3 to prevent collapsing thereof. The above application has since been abandoned and it is sufficient for an understanding of this invention to point out that the corrugated strips 3 consist of an elongated strip of relatively heavy paper, which has had its side edges initially folded inwardly 1A; of the width of the strip to form a double thickness along each side thereof. The folded side edges have then been again folded inwardly into abutting relation along the center of the strip to provide a finished 3 ply strip of considerable thickness.

(Cl. 21B-169) After the 3 ply striphas been transversely corrugated and while it is held in corrugated position the bases of each corrugation are permanently secured by adhesive to the previously mentioned longitudinal strip 3. i

The filter sheet or blanket `of my invention designated generally by the numeral 6 comprises plies l, 'I of crepe paper preferably of good quality such for example as creped kraft paper. The plies are in the form of elongated sheets of suitable width and both plies `have diagonal 'corrugations 8 formed therein, these corrugations being desirably at an angle of 45" and I have found that they are satisfactory when of the order of l-- of an inch. That is, the corrugation may vary between 3% and 3% of an inch in width. The corrugations are closely spaced and terminate in spaced relation to the longitudinal edges 9 of the plies, providing border strips IU. These border strips are superimposed with the corrugations of the plies in cross relation. When the corrugations are at an angle of 45, the corrugagations of the plies are perpendicular to each other.

The border strips are secured together by stitches II or by adhesive I2 or both. This closes the ends of the corrugations but the liquid to be ltered can flow between the plies over the corrugations. The corrugations increase the filtering area of the filter sheet or blanket. The ends of the plies are secured together by the stitches I3. The stitches and adhesive are conventionally illustrated.

In assembling, the filtering sheet or blanket is convolutely wound with the spacer elements I, I disposed between the border strip portion of the sheet and may be conveniently wound around the tube 5 as is shown in the drawing. The filter element is relatively inexpensive to produce and it is commonly found more economical to replace the entire unit than to attempt to salvage by cleaning the filtering element. Filteration proceeds by presenting dirty oil to the exterior of the blanket, as by admitting the oil to a container in which the wrapped blanket is placed. Due to the convolute spacing of the turns of the blanket this oil is presented to all surfaces of the blanket and filters through the two plies of the blanket to the intersecting and interconnecting spaces formed between the plies by the corrugations. Such dirty and foreign matter as is not separated from the oil in passing through the plies adheres to the inner surfaces of the corrugations as the oil passes between the two plies. The :filtered plies or materially injuring the bres, there being a. substantial amount of slack-resulting from the creping to permit the forming offthe corrugations after the crepe plies have been produced in the usual manner.

Filters embodying the inventin'are'very economical to produce and at the same time highly eflicient.

fIfhaveillustratedand-described my invention inrwhat I\consder to bea highly practical embodimentthereof. I have-not attempted to illustrateordescribevarious embodiments or adaptations as it is believed that this disclosure will enablethosegskilled in--the art to embody or adapt --the Vinvention asmay be desired.

@Having `thus describedmy invention, what LI claim --a-s new-'and 'desire to secure by Letters Patent, is:

.fAffllter-.including"avpair of corrugated spacer 4 elements, the corrugations being of substantial depth, and a lter sheet convolutely wound with the spacer elements and comprising two plies of crepe paper having diagonal corrugations therein,

both ends of the diagonal corrugations terminat-l ing in spaced relation to both longitudinal edges of the plies providing border strips, the plies being arranged-with the corrugations thereof Ein crossing relation, both border strips on one ply being vsecured to the border strips on the other ply. vthe spacers being arranged between the joined Vborderstrips of the convolutions of the sheet.

WAYNE S. COOK.

' REFERENCES CITED The `following references are of record in the tile of this patent:

`UNITED STATES PATENTS 

